<template>
	<div>
		<!-- 面包屑导航 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>分类参数</el-breadcrumb-item>
		</el-breadcrumb>

		<!-- 卡片视图 -->
		<el-card>
			<!-- 警告 -->
			<el-alert title="注意:只允许为第三级分类设置相关参数!" type="warning" show-icon :closable="false">
			</el-alert>
			<!-- 选泽商品分类区 -->
			<el-row class="selectParams">
				<el-col>
					<span>选择商品分类：</span>
					<!--
						参数说明
						options 可选项数据源
						props 用来指定配置对象
						v-model 数据绑定！选中后的value
						clearable 是否支持清空选项
						change-on-select  是否允许选择任意一级的选项
					 -->
					<el-cascader
						expand-trigger="hover"
						:options="catelist"
						:props="cascaderProps"
						v-model="selectedKeys"
						@change="handleChange">
					</el-cascader>
				</el-col>
			</el-row>
			<!-- tabs区 -->
			<el-tabs v-model="activeName" type="card" @tab-click="handleTabClick">
				<!-- 动态参数 start -->
				<el-tab-pane label="动态参数" name="many">
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
					<!-- 动态参数表格 start -->
					<el-table :data="maryTableData" border stripe>
						<!-- 展开列 -->
						<el-table-column type="expand">
							<template slot-scope="scope">
								<!-- 循环渲染Tag -->
								<el-tag
								  v-for="(item, index) in scope.row.attr_vals"
								  :key="index"
								  closable
								  type="primary"
									@close="handleClose(index, scope.row)">
								  {{item}}
								</el-tag>
								
								<!-- 输入文本框 -->
								<el-input
								  class="input-new-tag"
								  v-if=" scope.row.inputVisible"
								  v-model="scope.row.inputValue"
								  ref="saveTagInput"
								  size="small"
								  @keyup.enter.native="handleInputConfirm(scope.row)"
								  @blur="handleInputConfirm(scope.row)"
								>
								</el-input>
								<!-- 添加的按钮 -->
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index" label="#"></el-table-column>
						<el-table-column 
						label="参数名称"
						prop="attr_name">
						</el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button type="danger" icon="el-icon-delete" size="mini" @click="deleteParmas(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
				
				<!-- 静态属性 start -->		
				<el-tab-pane label="静态属性" name="only">
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
					<!-- 静态属性表格 start -->
					<el-table :data="onlyTableData" border stripe>
						<!-- 展开列 -->
						<el-table-column type="expand">
							<template slot-scope="scope">
								<!-- 循环渲染Tag -->
								<el-tag
								  v-for="(item, index) in scope.row.attr_vals"
								  :key="index"
								  closable
								  type="primary"
									@close="handleClose(index, scope.row)">
								  {{item}}
								</el-tag>
								
								<!-- 输入文本框 -->
								<el-input
								  class="input-new-tag"
								  v-if=" scope.row.inputVisible"
								  v-model="scope.row.inputValue"
								  ref="saveTagInput"
								  size="small"
								  @keyup.enter.native="handleInputConfirm(scope.row)"
								  @blur="handleInputConfirm(scope.row)"
								>
								</el-input>
								<!-- 添加的按钮 -->
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
						
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index" label="#"></el-table-column>
						<el-table-column 
						label="属性名称"
						prop="attr_name">
						</el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button type="danger" icon="el-icon-delete" size="mini" @click="deleteParmas(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
			</el-tabs>
			
			<!-- 添加参数的对话框 -->
			<el-dialog
			  :title="'添加' + titleText"
			  :visible.sync="addDialogVisible"
			  width="50%"
				@close="addDialogClosed">
			  <el-form 
				:model="addForm" 
				:rules="addFormRules" 
				ref="addFormRef"
				label-width="100px">
			    <el-form-item :label="titleText" prop="attr_name">
			      <el-input v-model="addForm.attr_name"></el-input>
			    </el-form-item>
				</el-form>
			  <span slot="footer" class="dialog-footer">
			    <el-button @click="addDialogVisible = false">取 消</el-button>
			    <el-button type="primary" @click="addParams">确 定</el-button>
			  </span>
			</el-dialog>
			
			<!-- 修改参数的对话框 -->
			<el-dialog
			  :title="'修改' + titleText"
			  :visible.sync="editDialogVisible"
			  width="50%">
			  <el-form 
				:model="editForm" 
				:rules="editFormRules" 
				ref="editFormRef"
				label-width="100px"
				@close="editDialogClosed">
			    <el-form-item :label="titleText" prop="attr_name">
			      <el-input v-model="editForm.attr_name"></el-input>
			    </el-form-item>
				</el-form>
			  <span slot="footer" class="dialog-footer">
			    <el-button @click="editDialogVisible = false">取 消</el-button>
			    <el-button type="primary" @click="editParams">确 定</el-button>
			  </span>
			</el-dialog>
		</el-card>
	</div>
</template>

<script>
	export default {
		data() {
			return {
				// 商品分类的数据，默认为空
				catelist: [],
				// 指定级联选择器的配置对象
				cascaderProps: {
					value: 'cat_id',
					label: 'cat_name',
					children: 'children'
				},
				// 选中的父级分类的id数组
				selectedKeys: [],
				// 被激活的tab名称
				activeName: 'many',
				// 动态参数数据
				maryTableData: [],
				// 静态属性数据
				onlyTableData: [],
				// 显示或隐藏 （添加动态参数/添加静态属性） 对话框
				addDialogVisible : false,
				// 添加参数的表单数据对象
				addForm: {
					attr_name: ''
				},
				// 添加参数的表单验证规则
				addFormRules: {
					attr_name: [
						{ required: true, message: '请输入参数名称', trigger: 'blur' }
					]
				},
				// 显示或隐藏 （修改动态参数/修改静态属性） 对话框
				editDialogVisible : false,
				// 修改的表单数据对象
				editForm : {},
				// 修改参数的表单验证规则
				editFormRules: {
					attr_name: [
						{ required: true, message: '请输入参数名称', trigger: 'blur' }
					]
				},
			}
		},
		created() {
			this.getCateList()
		},
		methods: {
			// 获取所有商品分类列表
			async getCateList() {
				const data = await this.$http.get('categories')
				// 判断状态码
				if(data.data.meta.status !== 200) {
					return this.$message.error('获取商品分类列表失败！')
				}
				// 把数据列表赋值给 catelist
				this.catelist = data.data.data
			},
			// 级联选择器选中项变化函数
			handleChange() {
				this.getParmasData()
			},
			// tabs点击事件的处理函数
			handleTabClick() {
				console.log(this.activeName)
				this.getParmasData()
			},
			// 获取参数列表数据
			async getParmasData() {
				// 说明你选中的不是三级分类
				if(this.selectedKeys.length !== 3) {
					this.selectedKeys = []
					this.maryTableData = []
					this.onlyTableData = []
					
					return
				}
				// 没有return出去说明是三级分类
				// 根据所选的id，和当前所处的面板，获取相对于的数据
				const data = await this.$http.get(`categories/${this.cateId}/attributes`,{
					params: {sel : this.activeName}
				})
				
				// 判断状态码
				if(data.data.meta.status !==200) {
					return this.$message.error('获取数据失败！')
				}
				this.$message.success('获取数据成功！')
				
				// 赋值数据之前遍历attr_vals形成一个数组
				data.data.data.forEach((item) => {
					item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : [],
					// 控制Tag文本框的显示和隐藏
					item.inputVisible = false
					// Tag文本框输入的数据
					item.inputValue = ''
					
				})
				console.log(data.data.data)
				
				// 判断把动态参数和静态属性存在不同数组里
				if(this.activeName === 'many') {
					this.maryTableData = data.data.data
				}else {
					this.onlyTableData = data.data.data
				}
				
			},
			// 添加属性对话框关闭处理函数
			addDialogClosed() {
				this.$refs.addFormRef.resetFields()
			},
			// 点击按钮添加参数
			addParams() {
				this.$refs.addFormRef.validate(async (valid) => {
					// 表单预验证
					if(!valid) return
					
					// 发起请求
					const data = await this.$http.post(`categories/${this.cateId}/attributes`, {
						attr_name : this.addForm.attr_name,
						attr_sel : this.activeName
					})
					
					if(data.data.meta.status !== 201) {
						return this.$message.error('创建参数失败！')
					}
					
					this.$message.success('创建参数成功！')
					this.addDialogVisible = false
					this.getParmasData()
				})
			},
			// 点击按钮展示修改的对话框
			async showEditDialog(attr_id) {
				this.editDialogVisible = true
				
				const data = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
					params: {sel : this.activeName}
				})
				
				// 判断状态码
				if(data.data.meta.status !==200) {
					return this.$message.error('获取数据失败！')
				}
				this.editForm = data.data.data
				console.log(this.editForm)
				
			},
			// 修改对话框关闭事件
			editDialogClosed() {
				// 重置表单
				this.$refs.editFormRef.resetFields()
			},
			// 点击按钮确定提交修改参数事件函数
			editParams() {
				this.$refs.editFormRef.validate(async (valid) => {
					// 判断预验证是否通过
					if(!valid) return
					
					// 发起请求
					const data = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
						attr_name : this.editForm.attr_name,
						attr_sel : this.activeName
					})
					
					if(data.data.meta.status !== 200) {
						return this.$message.error('更新失败！')
					}
					 this.$message.success('更新成功！')
					 this.getParmasData()
					 this.editDialogVisible = false
				})
			},
			// 点击按钮确定提交删除参数事件函数
			async deleteParmas(attr_id) {
				const confirmResult = await	this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
					confirmButtonText: '确定',
					cancelButtonText: '取消',
					type: 'warning'
				}).catch((err) =>{
					return err
				})
				
				console.log(confirmResult)
				
				if(confirmResult === 'confirm'){
					// 发起请求
					const data = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
					
					if(data.data.meta.status !== 200) {
						return this.$message.error('删除失败！')
					}
					this.$message.success('删除成功！')
					this.getParmasData()
				}else{
					this.$message.info('你点击了取消按钮！')
				}				
			},
			// 文本框失去焦点或者摁下enter都会触发函数
			handleInputConfirm(row) {
				// 判断失去焦点或者enter后表单是否为空
				if(row.inputValue.trim().length === 0) {
					row.inputValue = ''
					row.inputVisible = false
					return
				}
				
				// 如果没有return,则证明输入了内容,需要做后续处理
				row.attr_vals.push(row.inputValue.trim())
				row.inputValue = ''
				row.inputVisible = false
				
				this.savaAttrVals(row)
			},
			// 保存本地attr_vals的数据
			async savaAttrVals(row){
				// 发起请求，保存这次操作
					const data = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
					attr_name : row.attr_name,
					attr_sel : row.attr_sel,
					attr_vals : row.attr_vals.join(',')
				})
				
				if(data.data.meta.status !== 200) {
					return this.$message.error('添加失败！')
				}
				this.$message.success('添加成功！')
			},
			// 点击按钮展示文本输入框
			showInput(row) {
				row.inputVisible = true
				// 让文本框自动获得焦点
				// $nextTick 方法的作用，就是当页面上的元素被重新渲染之后，才会执行回调函数中的代码
				this.$nextTick(_ => {
					this.$refs.saveTagInput.$refs.input.focus();
				});
			},
			// 删除attr_vals
			handleClose(index, row) {
				row.attr_vals.splice(index, 1)
				this.savaAttrVals(row)
			}
		},
		computed: {
			// 如果按钮要被禁用则返回true，否则false
			isBtnDisabled() {
				if(this.selectedKeys.length !== 3){
					return true
				}else{
					return false
				}
			},
			// 当前选中三级分类的id
			cateId() {
				if(this.selectedKeys.length === 3) {
					return this.selectedKeys[2]
				}
				return null
			},
			// 添加动态参数标题/添加静态属性标题
			titleText() {
				if(this.activeName === 'many') {
					return '动态参数'
				}else{
					return '静态属性'
				}
			}
		}
		
	}
</script>

<style lang="less" scoped>
	.selectParams{
		margin-top: 15px;
		margin-bottom: 15px;
	}
	.el-tag{
		margin: 8px;
	}
	
	.input-new-tag{
		width: 120px;
	}
</style>
